diff --git a/docker-compose.postgres.yml b/docker-compose.postgres.yml
index 695c8bc..bbfabe8 100644
--- a/docker-compose.postgres.yml
+++ b/docker-compose.postgres.yml
@@ -10,6 +10,7 @@ services:
     environment:
       - DB_CONNECTION=pgsql
       - DB_HOST=database
+      - DB_PORT=5432
       - DB_USERNAME=koel
       - DB_PASSWORD=<koel_password>
       - DB_DATABASE=koel